#mixly-lib-fs-op.blocklyTreeRow>div.blocklyTreeRowContentContainer>span.blocklyTreeIcon {
    background: url('../media/fs.svg') no-repeat;
    background-size: 100% auto;
}

#mixly-lib-fs-op.blocklyTreeRow.blocklyTreeSelected>div.blocklyTreeRowContentContainer>span.blocklyTreeIcon {
    background: url('../media/fs2.svg') no-repeat;
    background-size: 100% auto;
}

#mixly-lib-fs-item-op.blocklyTreeRow>div.blocklyTreeRowContentContainer>span.blocklyTreeIcon {
    background: url('../media/fs3.svg') no-repeat;
    background-size: 100% auto;
}

#mixly-lib-fs-item-op.blocklyTreeRow.blocklyTreeSelected>div.blocklyTreeRowContentContainer>span.blocklyTreeIcon {
    background: url('../media/fs4.svg') no-repeat;
    background-size: 100% auto;
}